<?php
// +----------------------------------------------------------------------
// | ThinkPHP [ WE CAN DO IT JUST THINK IT ]
// +----------------------------------------------------------------------
// | Copyright (c) 2006-2012 http://thinkphp.cn All rights reserved.
// +----------------------------------------------------------------------
// | Licensed ( http://www.apache.org/licenses/LICENSE-2.0 )
// +----------------------------------------------------------------------
// | Author: liu21st <liu21st@gmail.com>
// +----------------------------------------------------------------------
namespace Behavior;

/**
 * 语言检测 并自动加载语言包
 */
class CheckLangBehavior {
	
	// 行为扩展的执行入口必须是run
	public function run(&$params) {
		// 检测语言
		$this->checkLanguage ();
	}
	
	/**
	 * 语言检查
	 * 检查浏览器支持语言，并自动加载语言包
	 * 
	 * @access private
	 * @return void
	 */
	private function checkLanguage() {
		// 不开启语言包功能，仅仅加载框架语言文件直接返回
		if (! C ( 'LANG_SWITCH_ON', null, false )) {
			return;
		}
		$langSet = C ( 'DEFAULT_LANG' );
		$varLang = C ( 'VAR_LANGUAGE', null, 'l' );
		$langList = C ( 'LANG_LIST', null, 'zh-cn' );
		// 启用了语言包功能
		// 根据是否启用自动侦测设置获取语言选择
		if (C ( 'LANG_AUTO_DETECT', null, true )) {
			if (isset ( $_GET [$varLang] )) {
				$langSet = $_GET [$varLang]; // url中设置了语言变量
				cookie ( 'think_language', $langSet, 3600 );
			} elseif (cookie ( 'think_language' )) { // 获取上次用户的选择
				$langSet = cookie ( 'think_language' );
			} elseif (isset ( $_SERVER ['HTTP_ACCEPT_LANGUAGE'] )) { // 自动侦测浏览器语言
				preg_match ( '/^([a-z\d\-]+)/i', $_SERVER ['HTTP_ACCEPT_LANGUAGE'], $matches );
				$langSet = $matches [1];
				cookie ( 'think_language', $langSet, 3600 );
			}
			if (false === stripos ( $langList, $langSet )) { // 非法语言参数
				$langSet = C ( 'DEFAULT_LANG' );
			}
		}
		// 定义当前语言
		define ( 'LANG_SET', strtolower ( $langSet ) );
		
		// 读取框架语言包
		$file = THINK_PATH . 'Lang/' . LANG_SET . '.php';
		if (LANG_SET != C ( 'DEFAULT_LANG' ) && is_file ( $file ))
			L ( include $file );
			
			// 读取应用公共语言包
		$file = LANG_PATH . LANG_SET . '.php';
		if (is_file ( $file ))
			L ( include $file );
			
			// 读取模块语言包
		$file = MODULE_PATH . 'Lang/' . LANG_SET . '.php';
		if (is_file ( $file ))
			L ( include $file );
			
			// 读取当前控制器语言包
		$file = MODULE_PATH . 'Lang/' . LANG_SET . '/' . strtolower ( CONTROLLER_NAME ) . '.php';
		if (is_file ( $file ))
			L ( include $file );
	}
}
